Array substrate and display device

Abstract

An array substrate and a display device are disclosed. The array substrate includes: a base substrate; and a first electrically conductive layer and a second electrically conductive layer on the base substrate, wherein the base substrate is provided with at least one thin film transistor, each of the at least one thin film transistor includes a gate electrode disposed in the first electrically conductive layer, and a source electrode and a drain electrode disposed in the second electrically conductive layer, and wherein the drain electrode has a comb shape and includes a plurality of drain electrode sub-portions extending parallel to one another, and the source electrode has a comb shape and includes a plurality of source electrode sub-portions extending parallel to one another, and wherein at least one of the drain electrode and the source electrode includes an electrode body and an extending portion, the electrode body overlapping with the gate electrode, and the extending portion overlapping with a portion of the first electrically conductive layer other than the gate electrode.

The invention claimed is: 
     
       1. An array substrate comprising:
 a base substrate; and 
 a first electrically conductive layer and a second electrically conductive layer on the base substrate, 
 wherein the base substrate is provided with at least one thin film transistor, each of the at least one thin film transistor comprises a gate electrode disposed in the first electrically conductive layer, and a source electrode and a drain electrode disposed in the second electrically conductive layer, and wherein the drain electrode has a comb shape and comprises a plurality of drain electrode sub-portions extending parallel to one another, and the source electrode has a comb shape and comprises a plurality of source electrode sub-portions extending parallel to one another, 
 wherein at least one of the drain electrode and the source electrode comprises an electrode body and an extending portion, the electrode body overlapping with the gate electrode, and the extending portion overlapping with a portion of the first electrically conductive layer other than the gate electrode, and 
 wherein the plurality of drain electrode sub-portions comprises a first drain electrode sub-portion and a second drain electrode sub-portion, the first drain electrode sub-portion comprises a first electrode body and a first extending portion, the second drain electrode sub-portion comprises a second electrode body and a second extending portion, each of the first electrode body and the second electrode body overlaps with the gate electrode, each of the first extending portion and the second extending portion overlaps with the portion of the first electrically conductive layer other than the gate electrode, and the first extending portion and the second extending portion extend in a same direction. 
 
     
     
       2. The array substrate according to  claim 1 , wherein the plurality of drain electrode sub-portions and the plurality of source electrode sub-portions are alternately arranged in a first direction parallel to the base substrate. 
     
     
       3. The array substrate according to  claim 1 , wherein the plurality of source electrode sub-portions comprise a first source electrode sub-portion, a second source electrode sub-portion, and a third source electrode sub-portion, the first source electrode sub-portion, the second source electrode sub-portion, and the third source electrode sub-portion overlap with the gate electrode and extend in the same direction as the first extending portion and the second extending portion. 
     
     
       4. The array substrate according to  claim 3 , wherein the drain electrode comprises a drain electrode connection part electrically connecting the plurality of drain electrode sub-portions, and the source electrode comprises a source electrode connection part electrically connecting the plurality of source electrode sub-portions. 
     
     
       5. The array substrate according to  claim 4 , wherein the drain electrode connection part is connected to the plurality of drain electrode sub-portions at a right angle. 
     
     
       6. The array substrate according to  claim 4 , wherein at least a portion of an orthogonal projection of the drain electrode connection part on the base substrate is located between an orthogonal projection of the gate electrode on the base substrate and an orthogonal projection of the portion of the first electrically conductive layer other than the gate electrode on the base substrate. 
     
     
       7. The array substrate according to  claim 6 , further comprising:
 a lead-out electrode layer electrically connected to the drain electrode through a via hole, wherein an orthogonal projection of the via hole on the base substrate is located between the orthogonal projection of the gate electrode on the base substrate and the orthogonal projection of the portion of the first electrically conductive layer other than the gate electrode on the base substrate. 
 
     
     
       8. The array substrate according to  claim 7 , wherein the lead-out electrode layer extends in a same direction as the drain electrode connection part. 
     
     
       9. The array substrate according to  claim 1 , wherein the first electrically conductive layer further comprises a gate line connected to the gate electrode; and
 wherein each of the first extending portion and the second extending portion overlaps with the gate line. 
 
     
     
       10. The array substrate according to  claim 9 , wherein the first extending portion and the first electrode body are in a same straight line and the first extending portion is perpendicular to the gate line; and the second extending portion and the second electrode body are in a same straight line and the second extending portion is perpendicular to the gate line. 
     
     
       11. The array substrate according to  claim 1 , wherein an area of a region where the first extending portion overlaps with the portion of the first electrically conductive layer other than the gate electrode is smaller than or equal to an area of a region where the first electrode body overlaps with the gate electrode; and an area of a region where the second extending portion overlaps with the portion of the first electrically conductive layer other than the gate electrode is smaller than or equal to an area of a region where the second electrode body overlaps with the gate electrode. 
     
     
       12. The array substrate according to  claim 1 , wherein a sum of an overlap capacitance between the first electrode body and the gate electrode and an overlap capacitance between the first extending portion and the portion of the first electrically conductive layer other than the gate electrode is a constant value; or a sum of an overlap capacitance between the second electrode body and the gate electrode and an overlap capacitance between the second extending portion and the portion of the first electrically conductive layer other than the gate electrode is a constant value. 
     
     
       13. A display device comprising the array substrate according to  claim 1 . 
     
     
       14. An array substrate comprising:
 a base substrate; and 
 a first electrically conductive layer and a second electrically conductive layer on the base substrate, 
 wherein the base substrate is provided with at least one thin film transistor, each of the at least one thin film transistor comprises a gate electrode disposed in the first electrically conductive layer, and a source electrode and a drain electrode disposed in the second electrically conductive layer, the drain electrode comprises a first drain electrode sub-portion and a second drain electrode sub-portion extending parallel to each other and a drain electrode connection part electrically connecting the first drain electrode sub-portion and the second drain electrode sub-portion, the drain electrode connection part is disposed at a right angle to either of the first drain electrode sub-portion and the second drain electrode sub-portion, and 
 wherein at least one of the drain electrode and the source electrode comprises an electrode body and an extending portion, the electrode body overlapping with the gate electrode, the extending portion overlapping with a portion of the first electrically conductive layer other than the gate electrode, and the first drain electrode sub-portion is perpendicular to a gate line. 
 
     
     
       15. A display device comprising the array substrate according to  claim 14 . 
     
     
       16. An array substrate comprising:
 a base substrate; and 
 a first electrically conductive layer and a second electrically conductive layer on the base substrate, 
 wherein the base substrate is provided with at least one thin film transistor, each of the at least one thin film transistor comprises a gate electrode disposed in the first electrically conductive layer, and a source electrode and a drain electrode disposed in the second electrically conductive layer; 
 wherein the first electrically conductive layer further comprises a gate line electrically connected to the gate electrode and at least one protrusion projecting from the gate line, the protrusion is separated from the gate electrode, and at least one of the drain electrode and the source electrode overlaps with each of the gate electrode and the protrusion, 
 wherein the protrusion and the gate electrode project from the gate line in a same direction, and a length by which the protrusion projects from the gate line is greater than a length by which the gate electrode projects from the gate line, and 
 wherein the array substrate further comprises: a lead-out electrode layer electrically connected to the drain electrode through a via hole, wherein an orthogonal projection of the via hole on the base substrate is located between an orthogonal projection of the gate electrode on the base substrate and an orthogonal projection of the protrusion on the base substrate. 
 
     
     
       17. The array substrate according to  claim 16 , wherein the drain electrode comprises a first drain electrode sub-portion and a second drain electrode sub-portion extending parallel to each other and a drain electrode connection part electrically connecting the first drain electrode sub-portion and the second drain electrode sub-portion, the drain electrode connection part extends in a same direction as the lead-out electrode layer. 
     
     
       18. A display device comprising the array substrate according to  claim 16 .